place.cpp

给予QT的qps开源最新源码

/*
   qpegps is a program for displaying a map centered at the current longitude/
   latitude as read from a gps receiver.

   Copyright (C) 2002 Ralf Haselmeier <[e-mail]>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

#include "place.h"
#include <qfile.h>
#include <qmessagebox.h>

PlaceList::PlaceList()
{
   setAutoDelete(true);
}

int PlaceList::compareItems( Item s1, Item s2 )
{
   Place *p1 = (Place *)s1;
   Place *p2 = (Place *)s2;
   
   if (p1->pos.lat > p2->pos.lat)
      return -1;
   else if (p1->pos.lat < p2->pos.lat)
      return 1;
   else {
      if (p1->pos.lon < p2->pos.lon)
         return -1;
      else if (p1->pos.lon > p2->pos.lon)
         return 1;
      else
         return 0;
   }
   return 0;
}

void PlaceList::readPlaces( const QString &filename )
{
   // clear previous places
   clear();

   Place *newPlace;

   QFile placesFile(filename);
   
   if ( placesFile.open(IO_ReadOnly) ) {
      QTextStream t( &placesFile );
      t.setEncoding(QTextStream::UnicodeUTF8);
      QString pro;
      while ( !t.eof() ) {
         t >> pro;
	      if ( pro[0]=='#') 
            pro= t.readLine();
	      else {
            newPlace = new Place;
	         newPlace->name= pro;
	         t >> pro;
	         newPlace->pos.lat = pro.toDouble();
	         t >> pro;
	         newPlace->pos.lon = pro.toDouble();
	         t >> pro;
	         newPlace->altitude = pro.toDouble();
	         pro = t.readLine().stripWhiteSpace();
	         newPlace->comment= pro;
            append(newPlace);
         }
      }
      placesFile.close();
   }
   sort();

   // add none place
   newPlace = new Place;
   newPlace->name = QObject::tr("none");
   newPlace->pos.lat = 0;
   newPlace->pos.lon = 0;
   newPlace->altitude.val = 0;
   prepend(newPlace);
  
}

void PlaceList::writePlaces( const QString &filename )
{
   int ok=0;
   bool newpl;

   // make a backup copy
   ::remove(filename + "~");
   ::rename(filename, filename + "~");
   
   QFile placesFile(filename);
   if ( placesFile.exists() ) 
      newpl = false;
   else 
      newpl = true;
   if ( ! (placesFile.open(IO_WriteOnly)) ) { 
      while ( !QMessageBox::warning( NULL, "Saving places...", 
         "Can't open/create file:\n" + filename +
         "\nPlace not saved. Please check file/directory access rights.\n",
         "Try again","Ignore", 0, 0, 1 ) ) {
         ok =  placesFile.open(IO_WriteOnly);
         if (ok) 
            break;
      }
      if ( !ok ) {
         ::rename(filename+"~", filename); 
         return; 
      }
   }
   QTextStream t( &placesFile );
   t.setEncoding(QTextStream::UnicodeUTF8);
		 
   if ( newpl ) { 
      t << "#format is: <Name> <latitude (fload decimal)> <longitude (fload decimal)> <altitude> <comment>\r\n"; 
   }
   
   first();
   Place *pl = next();
   while ( pl != NULL ) {
      t << (pl->name+"\t" + QObject::tr("%1").arg(pl->pos.lat,6,'f') + 
         "\t" + QObject::tr("%1").arg(pl->pos.lon,6,'f') +
         "\t" + QObject::tr("%1").arg(pl->altitude.val,6,'f') + 
         "\t" + pl->comment + "\r\n");
      pl = next();
   };
   placesFile.close();
}